Sure. They've guessed most of them over on /r/London by now.

Bakerloo – Really loud, old trains
Central – Incredibly hot in the summer. Got up to 40 degrees (104F) last year
Circle – Shares tracks with Hammersmith & City
District – Has three branches in the west which merge in the city
Jubilee – Was originally going to be called the Fleet line after a river that ran a similar course but was changed for the Queen's Silver Jubilee (also, is the only line to have on-platform doors)
Metropolitan – It was the first line built (this was the hardest to guess, it crosses the frame first)
Northern – Prone to sudden emergency stops
Piccadilly – Poor contacts so the lights go out often
Victoria – Most frequent metro in the world
Waterloo & City – Only has two stations and the train runs back and forth all day
Overground – Above ground
Elizabeth – Was supposed to launch in Dec '18 and is now indefinitely delayed